My understanding was that both Ethanol and Methanol are harmful to your engine. I was under the impression, after reading my owners manual, that Ethanol is limited to 10-15% and that this is with the use of "co-solvents" that inhibit the harmful effects.
Just put "ethanol (or methanol)fuel aluminum " into google. Plenty of hits.
One site, selling racing carbs for garden tractors, just said that methanol will corrode aluminum if it couldn't evaporate. In your situation ..it should evaporate.